<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 400px;
            height: 400px;
            border: 1px dashed black;
        }

        .child {
            width: 100px;
            height: 100px;
            background-color: red;
            animation-name: myAnim;
            animation-duration: 10s;
        }

        @keyframes myAnim {
            10% {
                transform: translateX(300px);
            }

            50% {
                transform: translateY(300px);
            }

            100% {
                transform: translate(300px, 300px);
            }
        }
    </style>
</head>

<body>

    <div class="box">
        <div class="child"></div>
    </div>

</body>

</html>